金刚石增强稀土纳米硬质合金复合齿研究

以液相复合—连续还原碳化方法制备的纳米复合WC-Co粉末、共沉淀法制备的Ni-Ce粉末和真空蒸镀W膜金刚石为原料,采用热压活化烧结,在1050℃的烧结温度、70MPa烧结压力、保温(3～5)min烧结条件下,制取了具有良好抗冲击性能和耐磨性的金刚石增强稀土纳米硬质合金复合齿。复合齿基体的维氏硬度HV1≥1800,抗弯强度TRS≥2800MPa,合金晶粒度在(200～400)nm之间,复合齿超硬部分的磨耗比≥80。结果表明共沉淀法制备的Ni-Ce粉末显著降低了合金中微孔和杂质等组织缺陷,大大提高了金刚石增强纳米硬质合金复合齿的整体性能。

Research on Diamond Enhanced Rare Earth Cemented Carbide Composite Button

Nanocrystalline WC-Co composite powder that was produced by spray thermal decomposition-continuous and carbonization technology, Ni-Ce composite powder that produced by coprecipitating techniques and diamond that was plated W were used, and this paper adopted activated hot-pressing sintering process to prepare diamond enhanced cemented carbide composite button. Complete densification composite buttons with 200~400nm WC grains, HV1≥1700 hardness, transverse rupture strength(TRS)≥2800 and wear resistance ≥80 were prepared by activated hot-pressing sintering process for 3 to 5 minutes at temperature 1050℃ under a pressure of 70 MPa. The results show that Ni-Ce composite powder that produced by coprecipitating techniques can decline porosity and microstructure limitation, then properties of diamond enhanced nanocrytalline cemented carbide composite button are improved.